Math Calculators
Surface Area Calculator
Calculate the surface area of 3D shapes.
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Result
Surface area
94
About the Surface Area Calculator
Surface area is the total area of a 3D shape's outer surface — what you'd need to cover or paint. Pick a box, sphere, or cylinder, enter its dimensions, and the calculator returns the surface area. It's useful for material estimates, packaging, and geometry work.
How to use the Surface Area Calculator
- 1Enter your shape and its dimensions.
- 2Read the result instantly — it recalculates as you type.
- 3Adjust the numbers to model different scenarios.
Frequently asked questions
How do I calculate surface area?
By shape: box = 2(lw + lh + wh), sphere = 4πr², cylinder = 2πr² + 2πrh. This tool uses the right formula automatically.
Surface area vs volume?
Surface area covers the outside (units²); volume fills the inside (units³). Use the Volume Calculator for capacity.